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| <h1 id="rest-over-servlet">REST over Servlet</h1> |
| <p>REST over Servlet的本质是将Java Chassis作为一个Servlet，部署到支持Servlet的Web容器中。 通常有两种使用场景：第一种是在 |
| 独立的Web容器中部署运行，比如Tomcat；第二种是组合Spring Boot提供的Embedded Tomcat运行。 </p> |
| <p>本章节主要介绍在独立的Web容器中部署运行。在Spring Boot提供的Embedded Tomcat中运行，请参考 |
| <a href="../using-java-chassis-in-spring-boot/using-java-chassis-in-spring-boot.html">在Spring Boot中使用java chassis</a>。</p> |
| <h2 id="path">对外发布的Path</h2> |
| <p>当微服务部署到web容器中时，相对于独立运行，会涉及到web root以及servlet url pattern对url的改变。<br /> |
| 对于传统开发框架而言，需要consumer感知对方的完整url；比如web root为/mywebapp，url pattern为/rest，业务级path为/application，则consumer代码必须通过/mywebapp/rest/application来访问。<br /> |
| 这将导致一旦部署方式发生变化，比如从web容器变成standalone运行，则consumer或是producer必须修改代码来适配这个变化。 </p> |
| <p>建议使用ServiceComb的部署解耦特性，无论是consumer，还是producer，在代码中都不要感知web root以及url pattern，这样ServiceComb在运行时，会自动适配producer实例的web root以及url pattern。 </p> |
| <p>对于一些遗留系统改造，用户期望继续使用restTemplate.getForObject("cse://serviceName/mywebapp/rest/application"...)，这个时候，用户必须将接口定义的path定位为: /mywebapp/rest/application，例如：</p> |
| <pre><code>@RestSchema(schemaId = "test") |
| @RequestMapping(path = "/mywebapp/rest/application") |
| </code></pre> |
| <p>尽管如此，仍然推荐使用部署形态无关的方式来编码，可以减少后续由于部署形态变化，带来的修改代码问题。</p> |
| <h2 id="maven">maven依赖</h2> |
| <pre><code class="language-xml"><dependency> |
| <groupId>org.apache.servicecomb</groupId> |
| <artifactId>transport-rest-servlet</artifactId> |
| </dependency> |
| </code></pre> |
| <h2 id="_1">配置说明</h2> |
| <p>与servlet机制配合，涉及到以下几个概念：</p> |
| <ul> |
| <li> |
| <p>启动spring context<br /> |
| 注意以下几种启动方式，是N选1的关系，不要同时使用。 </p> |
| <ul> |
| <li> |
| <p>不使用springMVC的UI或RestController</p> |
| <pre><code><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" |
| version="3.0"> |
| <context-param> |
| <param-name>contextConfigLocation</param-name> |
| <param-value>classpath*:META-INF/spring/*.bean.xml</param-value> |
| </context-param> |
| <listener> |
| <listener-class>org.apache.servicecomb.transport.rest.servlet.RestServletContextListener</listener-class> |
| </listener> |
| </web-app> |
| </code></pre> |
| <p>其中<code>classpath*:META-INF/spring/*.bean.xml</code>可以不在contextConfigLocation中配置，因为ServiceComb机制会确保加载路径中包含它。<br /> |
| 这里仅仅是个示例，表示如果使用者需要定制contextConfigLocation，可以使用这个方法。 </p> |
| </li> |
| <li> |
| <p>使用springMVC的UI或RestController，且存在org.apache.servicecomb.transport.rest.servlet.CseDispatcherServlet </p> |
| <pre><code><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" |
| version="3.0"> |
| <servlet> |
| <servlet-name>SpringMVCServlet</servlet-name> |
| <servlet-class>org.apache.servicecomb.transport.rest.servlet.CseDispatcherServlet</servlet-class> |
| <load-on-startup>1</load-on-startup> |
| </servlet> |
| <servlet-mapping> |
| <servlet-name>SpringMVCServlet</servlet-name> |
| <url-pattern>yourUrlPattern</url-pattern> |
| </servlet-mapping> |
| </web-app> |
| </code></pre> |
| <p><strong>注意：</strong><br /> |
| 该servlet不是ServiceComb的处理入口，仅仅是UI或RestController的处理入口 </p> |
| </li> |
| <li> |
| <p>使用springMVC的UI或RestController，且不存在org.apache.servicecomb.transport.rest.servlet.CseDispatcherServlet<br /> |
| 需要继承springMVC的DispatcherServlet，再按CseDispatcherServlet的方式，配置自己的实现类</p> |
| <pre><code>@Override |
| protected WebApplicationContext createWebApplicationContext(ApplicationContext parent){ |
| setContextClass(CseXmlWebApplicationContext.class); |
| return super.createWebApplicationContext(parent); |
| } |
| </code></pre> |
| </li> |
| </ul> |
| </li> |
| <li> |
| <p>ServiceComb servlet<br /> |
| url pattern根据业务自身规划设置即可，下面的<code>/rest/*</code>仅仅是示例，不是固定值。<br /> |
| url pattern必须以<code>/*</code>结尾<br /> |
| 以下两种声明方式也是多选一的关系，不要同时使用</p> |
| <ul> |
| <li> |
| <p>标准声明</p> |
| <pre><code><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" |
| version="3.0"> |
| <servlet> |
| <servlet-name>RestServlet</servlet-name> |
| <servlet-class>org.apache.servicecomb.transport.rest.servlet.RestServlet</servlet-class> |
| <load-on-startup>1</load-on-startup> |
| <async-supported>true</async-supported> |
| </servlet> |
| <servlet-mapping> |
| <servlet-name>RestServlet</servlet-name> |
| <url-pattern>/rest/*</url-pattern> |
| </servlet-mapping> |
| </web-app> |
| </code></pre> |
| </li> |
| <li> |
| <p>快捷声明 </p> |
| <p>在microservice.yaml文件中指定urlPattern，ServiceComb启动时会自动创建RestServlet，并设置相应的urlPattern：</p> |
| <pre><code>servicecomb.rest.servlet.urlPattern: /rest/* |
| </code></pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <h2 id="_2">典型场景配置示例</h2> |
| <ul> |
| <li> |
| <p>纯ServiceComb，标准声明<br /> |
| web.xml </p> |
| <pre><code> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" |
| version="3.0"> |
| <listener> |
| <listener-class>org.apache.servicecomb.transport.rest.servlet.RestServletContextListener</listener-class> |
| </listener> |
| <servlet> |
| <servlet-name>RestServlet</servlet-name> |
| <servlet-class>org.apache.servicecomb.transport.rest.servlet.RestServlet</servlet-class> |
| <load-on-startup>1</load-on-startup> |
| <async-supported>true</async-supported> |
| </servlet> |
| <servlet-mapping> |
| <servlet-name>RestServlet</servlet-name> |
| <url-pattern>/rest/*</url-pattern> |
| </servlet-mapping> |
| </web-app> |
| </code></pre> |
| </li> |
| <li> |
| <p>纯ServiceComb，快捷声明<br /> |
| web.xml</p> |
| <pre><code> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" |
| version="3.0"> |
| <listener> |
| <listener-class>org.apache.servicecomb.transport.rest.servlet.RestServletContextListener</listener-class> |
| </listener> |
| </web-app> |
| </code></pre> |
| <p>microservice.yaml：</p> |
| <pre><code> servicecomb.rest.servlet.urlPattern: /rest/* |
| </code></pre> |
| </li> |
| <li> |
| <p>springMVC UI或RestController接入请求，通过ServiceComb作为consumer发送到内部微服务<br /> |
| web.xml： </p> |
| <pre><code><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" |
| version="3.0"> |
| <servlet> |
| <servlet-name>SpringMVCServlet</servlet-name> |
| <servlet-class>org.apache.servicecomb.transport.rest.servlet.CseDispatcherServlet</servlet-class> |
| <load-on-startup>1</load-on-startup> |
| </servlet> |
| <servlet-mapping> |
| <servlet-name>SpringMVCServlet</servlet-name> |
| <url-pattern>yourUrlPattern</url-pattern> |
| </servlet-mapping> |
| </web-app> |
| </code></pre> |
| <p>microservice.yaml：不配置servicecomb.rest.address以及servicecomb.rest.servlet.urlPattern </p> |
| </li> |
| <li> |
| <p>springMVC UI或RestController接入一些请求，同时通过ServiceComb接入另一些请求<br /> |
| web.xml： </p> |
| <pre><code> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" |
| version="3.0"> |
| <servlet> |
| <servlet-name>SpringMVCServlet</servlet-name> |
| <servlet-class>org.apache.servicecomb.transport.rest.servlet.CseDispatcherServlet</servlet-class> |
| <load-on-startup>1</load-on-startup> |
| </servlet> |
| <servlet-mapping> |
| <servlet-name>SpringMVCServlet</servlet-name> |
| <url-pattern>yourUrlPattern</url-pattern> |
| </servlet-mapping> |
| </web-app> |
| </code></pre> |
| <p>microservice.yaml： </p> |
| <pre><code> servicecomb: |
| rest: |
| servlet: |
| urlPattern: /rest/* |
| address: 0.0.0.0:8080 |
| </code></pre> |
| </li> |
| </ul> |
| <h2 id="servlet-filter">使用servlet filter注意事项</h2> |
| <p>RestServlet工作于异步模式，根据servlet 3.0的标准，整条工作链都必须是异步模式，所以，如果业务在这个流程上增加了servlet filter，也必须将它配置为异步：</p> |
| <pre><code class="language-xml"><filter> |
| ...... |
| <async-supported>true</async-supported> |
| </filter> |
| </code></pre> |
| <h2 id="_3"><strong>配置项</strong></h2> |
| <p>REST over Servlet在microservice.yaml文件中的配置项见表3-9。</p> |
| <p>表1-1 REST over Servlet配置项说明</p> |
| <table> |
| <thead> |
| <tr> |
| <th align="left">配置项</th> |
| <th align="left">默认值</th> |
| <th align="left">含义</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left">servicecomb.rest.address</td> |
| <td align="left">0.0.0.0:8080</td> |
| <td align="left">服务监听地址<br>必须配置为与web容器监听地址相同的地址</td> |
| </tr> |
| <tr> |
| <td align="left">servicecomb.rest.server.timeout</td> |
| <td align="left">-1</td> |
| <td align="left">异步servlet超时时间, 单位为毫秒<br>建议保持默认值</td> |
| </tr> |
| <tr> |
| <td align="left">servicecomb.Provider.requestWaitInPoolTimeout${op-priority}</td> |
| <td align="left">30000</td> |
| <td align="left">在同步线程中排队等待执行的超时时间，单位为毫秒</td> |
| </tr> |
| <tr> |
| <td align="left">servicecomb.rest.server.requestWaitInPoolTimeout</td> |
| <td align="left">30000</td> |
| <td align="left">同servicecomb.Provider.requestWaitInPoolTimeout${op-priority}, 该配置项优先级更高。</td> |
| </tr> |
| <tr> |
| <td align="left">servicecomb.rest.servlet.urlPattern</td> |
| <td align="left">无</td> |
| <td align="left">用于简化servlet+servlet mapping配置<br>只有在web.xml中未配置servlet+servlet mapping时，才使用此配置项，配置格式为：/* 或 /path/*，其中path可以是多次目录</td> |
| </tr> |
| <tr> |
| <td align="left">servicecomb.uploads.maxSize</td> |
| <td align="left">无</td> |
| <td align="left">文件上传 form body 最大大小</td> |
| </tr> |
| <tr> |
| <td align="left">servicecomb.uploads.maxFileSize</td> |
| <td align="left">无</td> |
| <td align="left">文件上传所有文件总的大小限制</td> |
| </tr> |
| <tr> |
| <td align="left">servicecomb.uploads.fileSizeThreshold</td> |
| <td align="left">无</td> |
| <td align="left">文件上传，实际写入磁盘文件的最大大小</td> |
| </tr> |
| </tbody> |
| </table> |
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